Hey
I just started sone cleanups and fixing. A new version will be released soon.
I also migrated the project to github (https://github.com/Roemer/Waddu). So feel free to post issues there or even help improving it.

There are a lot of instances where the "Preferred Mapping" column (which actually shows a version # of that addons preferred mapping) either displays a "?" or is blank. !BugGrabber for example shows a "?". Bartender4's is blank, even though if you click the addon to view Addon Details (on the right of the gui) the version numbers for each mapping are known and displayed.